These Billet Hood Hingesfor 1947-54 Chevy 3100 trucksbolt directly into the stock mounting holes to update the standard stamped factory and spring assembly and include slots to adjust the alignment (Installation requires drilling four 3/16 holes to fasten the strut mount to the hood).These trick billet aluminum hood hinges really improve the looks of your engine compartment. The hinges are CNC machined from solid piecesof 6061-T6 billet aluminum in the USA. The hinges utilize a stainless steel nitrogen filled strut in place of the inferior stock compression springs to actuate the hood. The hinges use high quality sealed ball bearings at all pivot points for an ultra smooth and reliable operation.The hinges are available with a raw machined or bright polished finish. Add $50.00 for polished.Designed as direct fit, bolt on units, the hinges utilize the stock mounting holes with elongated slots for ease of gap adjustment.Whether you are looking for the ultimate in under-hood customizing or just want to replace your weak stamped-steel stock hood hinges with thesebillet hinges are the answer.